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client.go
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client.go
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// Copyright 2020 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package etcdv3
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"strings"
"time"
"go.etcd.io/etcd/client/v3/concurrency"
"github.com/douyu/jupiter/pkg/xlog"
grpcprom "github.com/grpc-ecosystem/go-grpc-prometheus"
clientv3 "go.etcd.io/etcd/client/v3"
//"go.etcd.io/etcd/mvcc/mvccpb"
mvccpb "go.etcd.io/etcd/api/v3/mvccpb"
"google.golang.org/grpc"
)
// Client ...
type Client struct {
*clientv3.Client
config *Config
}
// New ...
func newClient(config *Config) (*Client, error) {
conf := clientv3.Config{
Endpoints: config.Endpoints,
DialTimeout: config.ConnectTimeout,
DialKeepAliveTime: 10 * time.Second,
DialKeepAliveTimeout: 3 * time.Second,
DialOptions: []grpc.DialOption{
grpc.WithBlock(),
grpc.WithUnaryInterceptor(grpcprom.UnaryClientInterceptor),
grpc.WithStreamInterceptor(grpcprom.StreamClientInterceptor),
},
AutoSyncInterval: config.AutoSyncInterval,
}
config.logger = config.logger.With(xlog.FieldAddrAny(config.Endpoints))
if config.Endpoints == nil {
return nil, fmt.Errorf("client etcd endpoints empty, empty endpoints")
}
if !config.Secure {
conf.DialOptions = append(conf.DialOptions, grpc.WithInsecure())
}
if config.BasicAuth {
conf.Username = config.UserName
conf.Password = config.Password
}
tlsEnabled := false
tlsConfig := &tls.Config{
InsecureSkipVerify: false,
}
if config.CaCert != "" {
certBytes, err := ioutil.ReadFile(config.CaCert)
if err != nil {
config.logger.Panic("parse CaCert failed", xlog.Any("err", err))
}
caCertPool := x509.NewCertPool()
ok := caCertPool.AppendCertsFromPEM(certBytes)
if ok {
tlsConfig.RootCAs = caCertPool
}
tlsEnabled = true
}
if config.CertFile != "" && config.KeyFile != "" {
tlsCert, err := tls.LoadX509KeyPair(config.CertFile, config.KeyFile)
if err != nil {
config.logger.Panic("load CertFile or KeyFile failed", xlog.Any("config", config), xlog.Any("err", err))
}
tlsConfig.Certificates = []tls.Certificate{tlsCert}
tlsEnabled = true
}
if tlsEnabled {
conf.TLS = tlsConfig
}
client, err := clientv3.New(conf)
if err != nil {
// config.logger.Panic("client etcd start panic", xlog.FieldMod(ecode.ModClientETCD), xlog.FieldErrKind(ecode.ErrKindAny), xlog.FieldErr(err), xlog.FieldValueAny(config))
return nil, fmt.Errorf("client etcd start failed: %v", err)
}
cc := &Client{
Client: client,
config: config,
}
config.logger.Info("dial etcd server")
return cc, nil
}
// GetKeyValue queries etcd key, returns mvccpb.KeyValue
func (client *Client) GetKeyValue(ctx context.Context, key string) (kv *mvccpb.KeyValue, err error) {
rp, err := client.Client.Get(ctx, key)
if err != nil {
return nil, err
}
if len(rp.Kvs) > 0 {
return rp.Kvs[0], nil
}
return
}
// GetPrefix get prefix
func (client *Client) GetPrefix(ctx context.Context, prefix string) (map[string]string, error) {
var (
vars = make(map[string]string)
)
resp, err := client.Get(ctx, prefix, clientv3.WithPrefix())
if err != nil {
return vars, err
}
for _, kv := range resp.Kvs {
vars[string(kv.Key)] = string(kv.Value)
}
return vars, nil
}
// DelPrefix 按前缀删除
func (client *Client) DelPrefix(ctx context.Context, prefix string) (deleted int64, err error) {
resp, err := client.Delete(ctx, prefix, clientv3.WithPrefix())
if err != nil {
return 0, err
}
return resp.Deleted, err
}
// GetValues queries etcd for keys prefixed by prefix.
func (client *Client) GetValues(ctx context.Context, keys ...string) (map[string]string, error) {
var (
firstRevision = int64(0)
vars = make(map[string]string)
maxTxnOps = 128
// getOps = make([]string, 0, maxTxnOps)
)
doTxn := func(ops []string) error {
txnOps := make([]clientv3.Op, 0, maxTxnOps)
for _, k := range ops {
txnOps = append(txnOps, clientv3.OpGet(k,
clientv3.WithPrefix(),
clientv3.WithSort(clientv3.SortByKey, clientv3.SortDescend),
clientv3.WithRev(firstRevision)))
}
result, err := client.Txn(ctx).Then(txnOps...).Commit()
if err != nil {
return err
}
for i, r := range result.Responses {
originKey := ops[i]
originKeyFixed := originKey
if !strings.HasSuffix(originKeyFixed, "/") {
originKeyFixed = originKey + "/"
}
for _, ev := range r.GetResponseRange().Kvs {
k := string(ev.Key)
if k == originKey || strings.HasPrefix(k, originKeyFixed) {
vars[string(ev.Key)] = string(ev.Value)
}
}
}
if firstRevision == 0 {
firstRevision = result.Header.GetRevision()
}
return nil
}
cnt := len(keys) / maxTxnOps
for i := 0; i <= cnt; i++ {
switch temp := (i == cnt); temp {
case false:
if err := doTxn(keys[i*maxTxnOps : (i+1)*maxTxnOps]); err != nil {
return vars, err
}
case true:
if err := doTxn(keys[i*maxTxnOps:]); err != nil {
return vars, err
}
}
}
return vars, nil
}
//GetLeaseSession 创建租约会话
func (client *Client) GetLeaseSession(ctx context.Context, opts ...concurrency.SessionOption) (leaseSession *concurrency.Session, err error) {
return concurrency.NewSession(client.Client, opts...)
}